In this case, tie a belt or rope to the lever handle from the chair as outlined next to prevent it from opening downward or upward. Lever-style door handles tend to be easier to lock than door ...

The Mule Knot (a.k.a releasable knot) is ideal to lock off the rope on the belay plate. There are many occasions in climbing when, belaying from the harness using a device which does not self-arrest ...